Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a56b53ba55b69d…

MALICIOUS

PDF

78.4 KB Created: 2021-08-17 12:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16422cc09ea62a935a75a5fab8fb34da SHA-1: 18d482252659d34521b121ce02a1d2d27526e321 SHA-256: 60a56b53ba55b69de2a74e546c5edb7c6ae9d368ff2745f74173faedbf39c3c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=writing+one+variable+equations+from+word+problems+worksheet PDF link annotation
    • http://soft-pro.hr/upload/datoteke/pobirigifafabikodovamez.pdfIn PDF document text
    • http://nenorm.com/files/files/88398997360.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a51afa9b9ac---40860019441.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/54326034654.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/603e79b7e0390593076510efff04b575/vagaxudoduxexuvomezu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fef7b1efc---39482781297.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1d9fb77---pudabazukasuvaxoz.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210731035256_9wcntf.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xudalusuzaxibunotexifelut.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/63320405103.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/57e2a7ea4f4207e9dfd0983704529667/94919790628.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/tudaxujujisetixot.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/98671447503.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/a8826b670a5cb1a020087f78617a0af8/54647338326.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ioce2rh8epu64ob8mk01io66n7/ledavuvakimobalufilar.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/867ffe7e0d3ef6027806bf0b0a7af5f2/26062173435.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vazavijumexajepi.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/befenobupozanes.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zadunulodowazamiw.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/76007416621.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/gokipuxexutajusodulege.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/lugibifexator.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082d22b8d75d---71706302764.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/wogiliv.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/287230d7348eb67e15a60c68bec962bb/43678813639.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 16856 bytes
SHA-256: bf047c55ddc09c327e2d436e9cb8ace65079f77e9e5cc10567de6872d1436267
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 11568 bytes
SHA-256: 559a13e28fd78ed94b24a5d856768a011f3d203d912c3ec44f804e4f34aefcc8